Method of avoiding loss of heat in furnaces.



` No MODEL.

i l A. KURZWBRNART. y METHOD 0T AVoIDINGLoss 0T HEAT INTURNAGBS.

APPLIUATION FILED FEB. 24, 1904.

PATNTED yMAY 2 4-, 1904.

, AUNITRDv4 STATESv /ADALBERT KURZWERNHART, oF ZUoK-MANTEL, NEAR Patented May 24, 1904.

HUNGARY. f.

METHOD oF AfvolDlNG. Loss `F .HEATl IN FURNACES.

SPECIFICATION forming 'part of Letters Patet'No. r760,633, dated May 24, 1904.

Application ned February 24,1904.

This invention relates to improvements in Siemens regenerative furnaces, and hasv forV its object to provide. means for preventing loss of gas on reversing the controlling-valve. In reversing the gas and air current in Sie- `mensl furnaces loss of the gases of combustion is caused not only by the escape of the gas through the valve into the chimney during they period lof reversing, but also chiefly from the fact that after the reversal has taken place the whole contents of the regenerative chamber is emptied into the chimney, and thus escapes without being used.

This invention relates to amethod forcomf pletely avoiding the loss of gas on reversing c the direction of the iow.

The method inwhich the loss of gas take place and my novel method of avoiding such 4 loss'will be understood by reference to the accompanying drawings, in which,-

Figures l and 2 are horizontal sections through one of the regenerative chambers and passages of a Siemens furnace, and Figs. 3

and 4 are sectional'views of suitable forms of -device by means of which the invention can be carried out in practice.

In Fig. l the valve is shown in the position before the direction of iow of the gas-current isreversed. l and 4 are the two air regenerative chambers; 2 and 3, the two gas re- Serial No.195,062. (No specimens.) Y

the chamber 4. The products of combustion which are contained in both the above-named chambers are then caused toiow into the` furnace situated above the regenerative chambers and thence into the `chambers land 2. The air lcontained in the chamber l escapes into the chimney. Also the gaseous contents ofthe chamber 2 and of the passage 10,' Fig. 2escape into lthe chimney. In every'v position ofthe reversing-valve 7 intermediate betweenlthe positions indicated in Figs. l and 2 there exists a direct connection between -the gas-passage 5 andthe chimney 9, so that in such positions the gascan escape unused directly intov the chimney. In order now to avoid such loss of gas,y according to this invention I arrange for cutting off the iow of TEPLITZ, AUSTRIA- .gas to the' regenerative chamber by closing into the furnace, where it meets with theair which flows upward in the usual manner from the air regenerative chamber l and is consumed. When now ity is ascertained by the the gas has been utilized from the gas regenerative chamber, the ab ave-mentioned air-inlet opening is closed, the direction of the current is reversed in the usual way,and the gascut-off device, which has been closed, is again opened. vAt the moment of the decrease of the flame in the furnace the gas regenerative chamber 2 is filled only with air instead of with gas, as has heretofore been the case. All the other chambers have the contents they possessed before the reversing operation, as above described, so that the further continuation of the' heating or of the combustionafter the reversing takes place in the usual way. The diiference is that only the air contained in the chamber 2 and which serves to displace the gas is emptied into the chimney, whereas heretofore a like volume of gas has been lost and also gas corresponding in volume to that of the gas-passage'lO. At the same time the loss entailed by the direct escape of gas from the passage during the reversing operation isl completely avoided.

In applying the invention to a regenerative furnace the gas-supply must be provided with a suitable form of cutoff device, and, furthermore, an air-opening which is capable of being closed must be arranged at any suitable point-for example, behind the cut-off device (in the direction of the gas-current) or at a point in the gas passage. These two devicesvnamely, the gas-cut-oif device and the air-inlet opening-can be, where not already existing, adapted to any regenerative furnace whatever the type of reversing device with which it is provided.

Fig. 3'shows, by way of example, a mode of carrying out thev invention. The gas is conveyed to the passage 5 through the passage 11. cut-off device, which is here shown in the form of the valve 12. In the figure the valve is illustrated as being closed inl full lines and fully open in broken lines. At the side of the passage 5 there is provided the air-inlet opening 14, which is adapted to be Aclosed by the valve 13. rIhe said valve 13 is shown open in the full lines and closed in the broken lines. The position of the reversing-valve 7 corresponds to the position illustrated in Fig.

1, wherein the gas iows through the regen-Y the valve 7 is reversed to the position shown rlhe gas-How can be cut off by the The air then in Fig. 2, and then valve 12 is opened for the further normal continuation of the supply of air and gas for combustion.

Both the devices essential for the above-described process-namely,thegas-eut-otf device and the air-inlet opening-can be united to form asingle device, as shown. by way of example, in Fig. 4. In this arrangement only one valve 15 is provided in the gas-supply passage 16, and the end of the passage is left open at 17. The dotted position of the valve 15 shows the position for ordinary heating. Before the reversal the valve is brought to the position indicated in full lines in Fig. 4, whereby the gas is cut ofi' and air flows in the abovedescribed manner through the opening 17, as indicated by the arrows.

The construction and arrangement of the two necessary devicesgthat is to say, the gascut-off device and the air-inletI opening-ean be modified in any other suitable way. It is only essential that the air-inlet opening shall be arranged as nearly as possible in the neighborhood of the gas-eut-otl' device in 0rder to avoid a blind passage, in which an easily-explosible gas mixture could collect.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- A method of avoiding loss of gas in Siemens regenerative furnaces wherein, before the reversing operation, the gas contained in the regenerative chamber and in the passages connected therewith is forced into the furnace by air which, after the gas has been cut oli in a known manner, is introduced through a lateral opening, substantially as hereinbefore described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

Witnesses:

HERMANN SCHULZE, PAUL E. SCHILLING. 

